So I just started playing this game and decided to test the hardest difficulty and it seems enemies are really accurate with their shots or is it just me? If I go in guns blazing cod style I get my ♥♥♥ handed to me. So its use stealth or die? Lol I didnt expect those terrorists on 1st level to have such good marksmanship..

This isn't a COD game - it definitely lends itself to stealth. You get far more experience points from takedowns & not being seen than from a blazing guns attack. However, if you want to run & gun, I would advise fully upgrading your dermal armor, getting a pistol with the armor-piercing upgrade, and learning to use the cover system smoothly. Firing from cover is the best way to do an all out attack, unless you want to Typhoon everyone to death.

Going through the front door in a room with 5 guys is not a good idea, yes. But you got mines, you can gain high ground and you can go range, stuff like that. Use some tactics. While I'd say that stealth is easier, I often lost my patience and decided to just gun everyone down because it isn't much harder and way quicker.Silenced weapons also come in handy even if not going for stealth, thanks to the AI. "Gee, whats that? A body! Guy must have had a heart attack."- "Quick, lets gather round the corpse and mourn him.""Greneade, get down!"

Is there a differenece in how much your energy will recharge? I'm playing on give me deus ex and I still only have 2 battery levels. The second one doesn't seem to recharge unless I consume a pro-genergy bar. Is this normal, or is something going on with my save file?

Call of Duty is schlock. Deus Ex is a real game. You don't ever go in "guns blazing" in any Deus Ex game, if you're smart. Regardless the difficulty. There are many gradations on a line between "guns blazing" and "pure stealth", you don't have to exist at one of the extreme poles.

It's simply that the "guns blazing" pole can't really work in a real game, like Deus Ex.

This basic lesson is simply taught you more profoundly, the higher you set the difficulty.